Gretta is 85 years old and having trouble with her hearing. She worked in a factory manufacturing auto parts for many years. The MOST likely reasons for her sensorineural hearing loss are normal aging and:

Gretta is 85 years old and having trouble with her hearing. She worked in a factory manufacturing auto parts for many years. The MOST likely reasons for her sensorineural hearing loss are normal aging and Prolonged exposure to ear splitting noise

Explanation:

Gretta is very old and has been working in a factory manufacturing auto parts for many years. So she has been exposed to ear-splitting noise for a long period. Ear-splitting noise is one that is extremely loud and it can hurt our ears.

So if we are surrounded by this sound for long then it will affect our ability to hear. After a particular age, the workers of such factories mostly face such problems in hearing. One of the reasons for Gretta's inability to hear is her age also. As we grow old we hear less due to weakness in our body parts.

answer; the sons of liberty;

she recieved a treatment not thought to be specifically effective in treating her disorder.